1996 Volvo D12 wia

error 14 - ecm not powered usually. Does relay click

does engine start?

 

when pin 29 is grounded - engine stops

 

no, but I think - they 10-12 ore 5 v

 

with code 4 engine starts with power derate.

but if pressure sensor ore gas pedal TPS is short and no 5v to supply sensors - engine wont starting

 

Inside ECM there is separate power supply for sensors.

All 5v sensors are supplied throught resistors to avoid internal ECM damage if 5v sensor power supply is short becouse of poor wiring ore bad sensor.

The problem is that if TPS ore MAP are short inside - no 5v. And engine cant run w/o 5v sensor supply.

To check what sensors are ok, what no u need VCADs pro.

It is easy to download old cracked version from pirate sites, but... This is too old engine and you need very old 555 adapter.

Volvo sells only 020. It is expencive/

http://www.amazon.com/Generic-Truck-Scanner-Diagnostic-Version/dp/B00IW5SD7M

This is chenese copy of 555. it is direct rs232 translator.

On old volvos they used datalink, it is phisically the same like j1587, but with limited protocol, becouse this engine was introduced in 1993, before J1587/J1708 were required by law.

Do u have 6 pin connector? can you post photo of diagnostic connector of your truck?

 

to be sure, separate EA connector and turn ignition on, and check MAP power supply voltage directly on ECM pin EA 25.

If no power supply - remove terminal EB 34 and try againe